It was launched in June 1998 after four years research and development work by a multi-disciplinary group of researchers and practitioners.

The system has been adopted on a nationwide basis, by a wide variety of mental health services, in particular primary care counselling services where the CORE-OM is the most widely used outcome measure.

Today this system is used by over 250 services and 3,500 clinicians to help measure, monitor and manage therapy outcomes. The collected data from CORE has led to the creation of one of the largest databases of practice-based evidence.